How can i make Project or Plugin to be pay to use?!

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C#

Hi!

I made a plugin for a program ( bot ) .. I want to make it pay to use..

What i mean that to make the plugin check the name of the account if it's exist in PaidList.txt

As example : Paid account name is "Ahmed", then i put the name "Ahmed" in text in host like this "http://1.1.1.0/PaidList.txt" And it will be like this "AccountName:DateExpire" (Ahmed:30/1/2013)

The plugin check this file and load all the data, and check :

if (PaidList.Contains("Ahmed"))
   {
      Plugin works !!
   }
   else
   {
      Message.show("You need to pay to use this plugin, sorry!");
   }

If there is another way to make system like this or better than this one.. Please tell me..

Or to make it like a server and client.. My PC is the server and connect to Mysql ( Navicat ) that contains the data.. Or with INI files.. Please Help anyway :)..

Thanks..

Regards,

Ahmed GameHackerPM (GH).